Study of marine carbon cycle based on stable carbon isotopic compositions of amino acids in marine sediments
| Project/Area Number |
22KJ0593
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| Project/Area Number (Other) |
21J20841 (2021-2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2021-2022) |
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| Section | 国内 |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
孫 語辰 東京大学, 理学系研究科, 特別研究員(PD)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2023: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Amino acid / Carbon cycle / Marine sediment / Isotope analysis / amino acid / marine sediment / microbial reworking / organic matter / diagenesis / carbon isotope |
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| Outline of Research at the Start |
In this research, I will isolate amino acids from marine sediments, and determine their concentrations and carbon isotopic compositions. Using amino acids as representative materials, I would like to reveal the dynamics of organic matter preservation and degradation under the sea floor.
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| Outline of Annual Research Achievements |
In this research, I studied the organic matter cycling in marine sediments based on carbon isotope ratios of amino acids. In the first year, I developed a new analytical method for the determination of carbon and nitrogen isotopic compositions of amino acids in environmental samples. Using the new method, high-accuracy analysis of amino acids in marine sediment samples can be achieved. Then, I determined carbon isotopic compositions of amino acids in several surface and sub-surface sediment samples taken from the Japan Sea and off-Boso Peninsula. Results show that carbon isotopic composition patterns of amino acids in sediment samples are very similar, regardless of their different deposition histories and environmental conditions. It shows that organic matter in these sediments have similar sources. On the other hand, a baseline shift of carbon isotopic composition patterns of amino acids indicates that syntheses of organic matter using the bottom dissolved inorganic carbon happened. It demonstrates the contribution of organic matter production in the deep sea. Besides the isotope analysis of individual amino acids, I have also developed a new method for the isotope analysis of individual L- and D-amino acids. In the future, this new method can be applied to determine the isotope ratios of D-amino acids in marine sediments, which can be used to study the microbial sources and transformations of organic matter in marine sediments. Overall, this research expanded our understanding of organic matter cycling in the deep ocean.
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Report
(3 results)
Research Products
(8 results)
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[Journal Article] Integrative assessment for amino acid nitrogen isotopic composition in biological tissue samples determined by GC/C/IRMS, LC x EA/IRMS, and LC x GC/C/IRMS.2022
Author(s)
Ishikawa, N. F., Ogawa, N. O., Sun, Y., Chikaraishi, Y., Takano, Y., and Ohkouchi, N.
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Journal Title
Limnology and Oceanography, Method
Volume: 20
Issue: 9
Pages: 531-542
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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